Concentrating percussion-table



2 Sheath-Sheet 1.

(No Model.)

M; B. DODGE.

, GONGENTRATING PERGUSSIONVTA'BLE. No. ;244,564. Patented July19, 1881.

a. Pain. Mumm. Wllhingon, n.c

(N0 Modgl.) I 2 sheets-amt 2.

M. B. DODGE.

. CONGENTR ATINGPERCUSSION TABLE.

No. 244,564. Patented July 19,1881.

WLfiIwJJ/e/S 4 ,2910621'507";

, cad/Yd V f To all whom it may concern the heavier concentration willpass, and from inclined table at a point near where the ma- MILES B.DODGE, OF SAN PAT T OFFICE.

FRANCISCO, CALIFORNIA.

CONCENTRATING PERCUSSION-TABLE. I

SPECIFICATION forming part of Letters Patent N0. 244,564, dated July 19,1881.

application filed October I5, 1880. (1N0 model.)

.Be it known that I,M1:LEs B. DODGE, of the city and county of SanFrancisco, and State of California, have invented an Improvement inConcentrating Percussion-Tables; and vI do hereby declare the followingto be a full, clear, and exact description thereof.

My invention relates to certain improvements in that class of devicesfor concentrating ores known as percussion-tables and my improvementsconsist in forming in the inclined table, above the point at which thepulp is received upon it, a depression or well, into which 1 which theyare continually discharged, while the lighter particles will passdownward with the current of water and be carried away, the action beingcontinuous, as is more fully-described in the accompanying drawings, inwhichr Figure 1 is a section of my concentrating apparatus, and Fig. 2is a plan view.

Percussion-tables, as ordinarily made, are suspended in such a manner asto have either an' end or side shake motion or a combination of bothmotions imparted to them. The table is set on an incline and thepulverized ore is brought upon it in a state of mechanical suspension inthe water, the motion of the table causing the ore so to arrange itselfthat the heavier grades will sink onto the surface of the table, whilethe lighter and worthless gangue will pass on down with the stream ofwater. Riftles, depression-boxes, and various other devices areemployedto collectthe heavier valuable portions, these being placed in thelineof flow of the substances being operated on. In all of thesepercussion-tables it is commonly necessary to slow down or stopoccasionally to push downward or forward the mass of concentrationswhich collects on the terial is received upon said table. If the motionis not stopped or slackened, the concen-' trated material is at any rateslowly stirred and spread, so it will move downward to the depressionsor boxes intended to receive it. When they become filled their contentsare removed.

I have found that when the comminuted ore mingled with water is spreadon a floor upon the inclined percussion-table the tendency of theheavier portion is to move upward unless, it becomes packed in too heavymasses. This tendency'isstill more marked when the lighter-gangue isWashed away from the pulp as soonasit is deposited on the table, andwhen a riffle or check is placed on the table just below the point atwhich the pulp is received;

My inclined percussion-table A is suitably supported in a frame, so thatan end-shake motion may be imparted to it by means of the cam B, saidcam throwing the table forward and springs B drawing it back., On thereverse movement the lugs G strike against the shoulders O and suddenlystop the movement of the table. The springs B have their forwardendsresting against the ends of a vertical spring-bar, W, which isinserted through the center of the head of the table, as shown, and hasits ends resting against nuts n on rods n. In returningthe table theelasticity of all the springs B B and W are brought into play. The pulpfrom the batteries is passed into the sluice D, and goes then onto thedistributingboard E, which'is provided with spreaders or distributers e,as shown. The sluice and distributerare inclined in the oppositedirection from the percussion-table, as shown, and the pulp is depositedon said table a short distance below its upper'end.

On the percussion-table, a short distance be low the mouth of thedistributor, is a riftle, f, and other riffles may also be placed belowthis on the table. Above the mouth of the distributer, and nearly at theupper end of the table, is a well or depression, G, formed across saidtable, and provided with an outlet, g, through which the concentratedmaterial constantly passes, the outlet being regulated in size inproportion to the amount'of mineral in the pulp. Over this depression isa perforated pipe, H, through which clean water is admitted to the wellor depression, and thence flows on down the table, part of it going outof the hole 9 with the concentration. As the pulp falls onto the tableit is concentrated in the usual way, the heavier metallic portionsettling to the bottom and the gangue passing off down with the water.The riffle f checks this heavy material, and, when checked, thepercussion IOU action of the table tends to move the heavier particlesup the incline of the table until it reaches the well or depression G,where it is caught and passes out of the discharge g to 5 a suitablereceptacle. The fresh supply of Water coming onto the table through theperforated pipe H flows down over the concentrations, and assists incleaning them and in carrying off the gaugue. This action is continu- [oous.

The advantage of the depression or well above the point at which thepulp is received is obvious. It forms a receptacle where theconcentrated material is taken out of the way 15 of the pulp. When theseconcentrations are caught in the boxes or riffles below where the pulpis fed to the table the whole mass of pulp and water passes over themand loss ensues. Here the separating action takes place imme- 2odiately, and the gangue goes one way while the concentrations go theother, both being discharged continuously.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is 2 5 1. In an ihclined percussion-table, adepression or well G, provided with the discharge g above the point atwhich the ore is received on said table, whereby a recep acle is formedfor the concentrations above the flow of pulp, 0 substantially as hereindescribed.

2. The vertical spring-bar passing through the head of the table, incombination with springs B B, rods n, and nuts n, all constructed,arranged, and operated as set forth. 35

In witness whereofl hereunto set my hand.

MILES B. DODGE.

Witnesses:

Guns. G. YALE, J osuru A. BAYLESS.

